Denray Posted October 28, 2013 Report Share Posted October 28, 2013 My dad was telling me how if your expansion tank is too small and it leaks out a little water every time it gets hot then the makeup water that comes in brings in oxygen each time and that gives the food for rust to grow. Otherwise it just rusts a bit then stops because all the oxygen gets used up. [:-bigeyes Quote Link to comment Share on other sites More sharing options...
mlparham Posted October 28, 2013 Report Share Posted October 28, 2013 My dad was telling me how if your expansion tank is too small and it leaks out a little water every time it gets hot then the makeup water that comes in brings in oxygen each time and that gives the food for rust to grow. Otherwise it just rusts a bit then stops because all the oxygen gets used up. [:-bigeyes It's hard to argue with Dad. Quote Link to comment Share on other sites More sharing options...
rkenney Posted October 28, 2013 Report Share Posted October 28, 2013 Interesting. How does the expansion tank being too small fit into this scenario? Quote Link to comment Share on other sites More sharing options...
Denray Posted October 29, 2013 Author Report Share Posted October 29, 2013 I guess when it can't expand any further it leaks out? Dad is a mechanical engineer too. Quote Link to comment Share on other sites More sharing options...
hoosier inspector Posted October 29, 2013 Report Share Posted October 29, 2013 1. A call for heat fires the boiler. 2. The system pressure increases with temperature. 3. An under sized tank (or water logged) quickly reaches capacity and ceases to function. 4. System pressure reaches limit. 5. Pressure relief valve discharges water out of the system. 6. Thermostat is satisfied and cuts out burner. 7. Water cools and contracts, lowering pressure enough (because of x-tank issue+missing water) for make-up regulator to introduce fresh oxygen rich water. This repeats with every heating cycle. Quote Link to comment Share on other sites More sharing options...
Denray Posted October 29, 2013 Author Report Share Posted October 29, 2013 8. And the rust shortens the life of the equipment. Thanks Robert. We just got back from a mad dash to UT and back to get some toys out of Dad's garage (house being sold) for my mechanical engineer son to have at his house. Poor kid. Click to Enlarge 47.52 KB Click to Enlarge 46.58 KB Quote Link to comment Share on other sites More sharing options...
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